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We present means and standard deviations of variables used in the analysis in table 1. Our sample consists of 523 production lines across thirty factories. The range of dates over which we have production data spans 1,001 days. However, we do not observe all factories for all dates.16 Altogether, our data include nearly 240,000 line by day observations. About one-third of the observations correspond to days in factories prior to the introduction of LED lighting, and the remainder are post-LED observations.

Table 1.
Summary Statistics: Weather, Production, and LED Introduction
Number of line-day observations 239,680  
Number of lines 523  
Number of days 1,001  
Number of factories 30  
 Mean Standard Deviation 
Weather   
Temperature (Celsius) 24.353 2.966 
Relative humidity (%) 0.647 0.174 
Wet bulb globe temperature (Celsius) 17.230 1.683 
Production   
Actual efficiency 55.234 26.233 
Budgeted efficiency 61.981 11.545 
Standard allowable minutes (SAM) 0.724 2.445 
Attendance   
1(Present for Full Work day) 0.843 0.363 
Number of line-day observations 239,680  
Number of lines 523  
Number of days 1,001  
Number of factories 30  
 Mean Standard Deviation 
Weather   
Temperature (Celsius) 24.353 2.966 
Relative humidity (%) 0.647 0.174 
Wet bulb globe temperature (Celsius) 17.230 1.683 
Production   
Actual efficiency 55.234 26.233 
Budgeted efficiency 61.981 11.545 
Standard allowable minutes (SAM) 0.724 2.445 
Attendance   
1(Present for Full Work day) 0.843 0.363 

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